Cripps Mission 

Demand for constituting Constituent assembly for framing their own constitution by Indian people were made by Jawahar Lal Nehru in 1938. In 1940, British Coalition government recognized the principle that Indians should themselves frame a new Constitution for autonomous India and in March 1942, Cripps was sent with draft declaration that provided
• A constituent assembly be elected to frame Indian constitution and India will be given Dominion status.
• There should be one India Union comprising all unions and Indian states
• Any province which was not ready to accept the constitution would be free to retains its constitutional position and can enter into separate constitutional arrangements.
As expected Cripps proposals were rejected by Muslim League protesting concept of one Indian union and one constituent assembly.